Why is Roy マスタング, マストン like so much?

If ya ask me, he's a total badasswhen he's using alchemy. There are some parts if his character I 愛 (like how badass he can be) and others that I don't.

He's very serious person, but he has made me laugh on many occasions. He's been through so much, and yet he stays strong and cheerful. I also 愛 watching him with Riza.